A 3 kg mass is attached to a spring on a level surface and is oscillating with amplitude of 30 cm. The spring has a constant, k= 3N/m. The spring is in equilibrium at time t=0. What is the kinetic energy at time t = 0 sec? 0.135 J
0.30 J
0.270 J
0.45 J

Amoving company collects data about couches they move and displays the data in a table. the force along the ramp, the angle of the ramp, and the height the couch is raised to are shown. which statements correctly compare the work done to move the couches? check all that apply. the same amount of work is done for couches 1 and 3. the same amount of work is done for couches 2 and 3. the work for couch 1 is greater than the work for couch 2. the work for couch 2 is less than the work for couch 3. the work for couch 3 is greater than the work for couch 1. the work for couch 2 is greater than the work for couch 1.